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Impact of climate change on mercury concentrations and deposition in the eastern United States
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2014 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 487, 299-312 p.Article in journal (Refereed) Published
Abstract [en]

The global-regional climate-air pollution modeling system (GRE-CAPS) was applied over the eastern United States to study the impact of climate change on the concentration and deposition of atmospheric mercury. Summer and winter periods (300 days for each) were simulated, and the present-day model predictions (2000s) were compared to the future ones (2050s) assuming constant emissions. Climate change affects He concentrations in both periods. On average, atmospheric Hg2+ levels are predicted to increase in the future by 3% in summer and 5% in winter respectively due to enhanced oxidation of Hg-0 under higher temperatures. The predicted concentration change of Hg2+ was found to vary significantly in space due to regional-scale changes in precipitation, ranging from -30% to 30% during summer and -20% to 40% during winter. Particulate mercury, Hg(p) has a similar spatial response to climate change as Hg2+, while Hg levels are not predicted to change significantly. In both periods, the response of mercury deposition to climate change varies spatially with an average predicted increase of 6% during summer and 4% during winter. During summer, deposition increases are predicted mostly in the western parts of the domain while mercury deposition is predicted to decrease in the Northeast and also in many areas in the Midwest and Southeast. During winter mercury deposition is predicted to change from 30% to 50% mainly due to the changes in rainfall and the corresponding changes in wet deposition.

Place, publisher, year, edition, pages
2014. Vol. 487, 299-312 p.
Keyword [en]
Climate change, Mercury, Deposition, GRE-CAPS
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-106185DOI: 10.1016/j.scitotenv.2014.03.084ISI: 000337259100034OAI: diva2:735608


Available from: 2014-07-29 Created: 2014-07-28 Last updated: 2014-07-29Bibliographically approved

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Murphy, Benjamin N.
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Department of Applied Environmental Science (ITM)
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